大气湍流严重限制地基天文望远镜的分辨率。在最好的观测台址和良好的能见度条件下,可见光波段的分辨率一般不超过1弧秒。过去的20年中发展了采用电变形镜的自适应光学系统,用以补偿湍流效应。可惜这类系统要求被观测天体附近有明亮的参考源,且只能用于观测最亮的星。通过用激光激发中圈钠层的共振反向散射,可在高层大气层建立控制自适应成像系统的人造导星。本文对激光导星自适应望远镜之设计要求及预期成像行为作了评论。 Atmospheric turbulence severely limits the resolution of ground-based telescopes. In the best observation sites and good visibility conditions, the resolution of the visible light band is generally not more than 1 arc second. Over the past two decades, adaptive optical systems using electro-deformable mirrors have been developed to compensate for turbulence effects. Unfortunately, such systems require bright reference sources near the object being observed and can only be used to observe the brightest stars. By using the laser to excite the resonant backscatter of the sodium ring in the middle ring, a man-made guide star controlling the adaptive imaging system can be established in the upper atmosphere. This article comments on the design requirements and the expected imaging behavior of laser guide star adaptive telescope.